upgrade on audi A4 1.8T
 

Hi All

just come across this excellent site, whilst browsing the web. I have a Audi A4 1.8T gmbh 03 plate. I want to upgrade the sound system (currently standard audi setup). How complicated is it to change my headunit, speakers and install a sub/amp in the car and does it effect the warranty on the car (even if a qualifies auto electrician does it)

many thanks in advance and thanks to all members for providing such an informative place for Audi fans.